"Grissom is pretty asexual. He's not that interested in anything other than work - except for Lady Heather. She's the closest to getting his heart of anyone"

This quote by William Petersen suggests that Grissom is a character who is not interested in anything other than work. He is represented as nonsexual, indicating he does not have any libidos or interests. Nevertheless, the exception to this is Lady Heather, who is the only person to have gotten close to his heart. This implies that Grissom has some sort of emotional connection with Lady Heather, which is different from his normal lack of interest in anything aside from work. It is possible that Grissom has developed feelings for Lady Heather, which is why she is the only one to have gotten near to his heart. This quote offers insight into Grissom's character and his relationship with Lady Heather.